Mysql server is not running after ZCS upgrade from zcs-6.0.6 to zcs-7.2.3

Dear All,

I have performing testing on my production dump for zimbra upgrade from zcs-6.0.6_GA_2330.RHEL5_64 to zcs-7.2.3_GA_2872.RHEL5_64.
After upgradation mysql.server is not getting started and giving error as below :